how would you calculate altitude given airspeed, rate of descent and time? I'm trying to find the change in altitude

To calculate the change in altitude, you can use the following formula:

Change in altitude = Airspeed × Time × Rate of descent

Here's how you can calculate it step by step:

1. Start by determining the values you have:
- Airspeed: The speed at which the aircraft is moving horizontally through the air, usually measured in knots (nautical miles per hour).
- Rate of descent: The vertical speed at which the aircraft is descending, usually measured in feet per minute.
- Time: The duration for which the descent is occurring, usually measured in minutes.

2. Multiply the airspeed by the time:
- This will give you the horizontal distance covered during the descent.
- For example, if the airspeed is 100 knots and the descent lasted for 10 minutes, the horizontal distance covered would be 100 knots × 10 minutes = 1000 nautical miles.

3. Multiply the horizontal distance by the rate of descent:
- This will give you the change in altitude during the descent.
- For example, if the rate of descent is 500 feet per minute and the horizontal distance covered is 1000 nautical miles, the change in altitude would be 500 feet per minute × 1000 nautical miles = 500,000 feet.

Please note that this calculation assumes a constant airspeed and rate of descent. In real-world scenarios, these values may vary, so this formula provides an approximate estimate.